- Broken, cracked or collapsed pipe - damaged pipes requiring repair or replacement
- Offset pipe - sewer pipes have become misaligned due to shifting of soil, frozen ground, settling, etc.
- Blockage - grease buildup or a foreign object is restricting or prohibiting proper flow and/or cleaning of the line.
- Corrosion - the pipe has deteriorated and/or broken, causing collapses in the line and restricting flow.
- Bellied pipe - a section of the pipe has sunk due to ground or soil conditions, creating a valley that collects paper and waste.
- Leaking joints - the seals between pipes have broken, allowing water to escape into the area surrounding the pipe.
- Root infiltration - tree or shrub roots have invaded the sewer line, preventing normal cleaning and/or have damaged the line.
- Off-grade pipe — existing pipes are constructed of substandard material that may have deteriorated or corroded.